Bacteria and Foodborne Illness

Bacteria and Foodborne Illness

Foodborne illness results from eating food contaminated with bacteria (or their toxins) or other pathogens such as parasites or viruses. The illnesses range from upset stomach to more serious symptoms, including diarrhea, fever, vomiting, abdominal cramps and dehydration. Although most foodborne infections are undiagnosed and unreported, the Centers for Disease Control and Prevention estimates that every year about 76 million people in the United States become ill from pathogens in food. Of these, about 5,000 people die.

Causes

Harmful bacteria are the most common causes of foodborne illnesses. Some bacteria may be present on foods when you purchase them. Raw foods are not sterile. Raw meat and poultry may become contaminated during slaughter. Seafood may become contaminated during harvest or through processing. One in 20,000 eggs may be contaminated with Salmonella inside the egg shell. Produce such as lettuce, tomatoes, sprouts, and melons can become contaminated with Salmonella, Shigella, or Escherichia coli (E. coli) O157:H7. Contamination can occur during growing, harvesting, processing, storing, shipping or final preparation. Sources of contamination are varied; however, these items are grown in the soil and therefore may become contaminated during growth or through processing and distribution. Contamination may also occur during food preparation in the restaurant or in the person’s kitchen.

When food is cooked and left out for more than 2 hours at room temperature, bacteria can multiply quickly. Most bacteria grow undetected because they do not produce an “off” odor or change the color or texture of the food. Freezing food slows or stops bacteria’s growth but does not destroy the bacteria. The microbes can become reactivated when the food is thawed. Refrigeration may slow the growth of some bacteria, but thorough cooking is needed to destroy the bacteria.

Symptoms

In most cases of foodborne illness, symptoms resemble intestinal flu and may last a few hours or even several days. Symptoms can range from mild to serious and include:

abdominal cramps

nausea

vomiting

diarrhea

fever

dehydration

Risk Factors

Some people are at greater risk for bacterial infections because of their age or immune status. Young children, pregnant women and their fetuses, the elderly and people with lowered immunity are at greatest risk.

Complications

Some microorganisms, such as Listeria monocytogenes and Clostridium botulinum, cause far more serious illness than vomiting or diarrhea. They can cause spontaneous abortion or death.

In some people, especially children, hemolytic uremic syndrome (HUS) can result from infection by a particular strain of bacteria, E. coli O157:H7 and can lead to kidney failure and death. HUS is a rare disorder that affects primarily young children between the ages of 1 and 10 years and is the leading cause of acute renal failure in previously healthy children. The child may become infected after consuming a contaminated food, such as meat (especially undercooked ground beef), unpasteurized apple cider or apple juice, or raw sprouts.

The most common symptoms of infection are vomiting, abdominal pain, and diarrhea, which may be bloody. In 5 to 10 percent of cases, HUS develops about 2 to 6 days after the onset of illness. This disease may last from 1 to 15 days and is fatal in 3 to 5 percent of cases. Symptoms of HUS include fever, lethargy, irritability and pallor. In about half the cases, the disease progresses until the kidneys are unable to remove waste products from the blood and excrete them into the urine (acute renal failure). A decrease in circulating red blood cells and blood platelets and reduced blood flow to organs may lead to multiple organ failure. Seizures, heart failure, inflammation of the pancreas and diabetes can also result. However, most children recover completely.

You need to see a doctor right away if you have any of the following symptoms, with or without gastrointestinal symptoms:

Signs of shock such as a weak or rapid pulse, shallow breathing, cold, clammy, pale skin, shaking or chills, or chest pain.

Diagnosis

Your doctor may be able to diagnose foodborne illness from a list of what you’ve recently eaten and results from the proper laboratory tests. Diagnostic tests for foodborne illness should include examination of the feces. A sample of the suspected food, if available, can also be tested for bacteria and their toxins as well as for viruses and parasites.

Treatment

Most cases of foodborne illness are mild and can be treated by increasing fluid intake, either orally or intravenously, to replace lost fluids and electrolytes. In cases with gastrointestinal or neurologic symptoms, people should seek medical attention.

In the most severe situations, such as HUS, the patient may need hospitalization in order to receive supportive nutritional and medical therapy. Maintaining adequate fluid and electrolyte balance and controlling blood pressure are important. Doctors will try to minimize the impact of reduced kidney function. Early dialysis is crucial until the kidneys can function normally again and blood transfusions may be needed.

Prevention

Most cases of foodborne illness can be prevented through proper cooking or processing of food, which kills bacteria. In addition, because bacteria multiplies rapidly between 40°F and 140°F, food must be kept out of this “danger zone.”

To prevent harmful bacteria from growing in food, always

Refrigerate foods promptly. If you let prepared food stand at room temperature for more than 2 hours, it may not be safe to eat. Set your refrigerator at 40°F or lower and your freezer at 0°F.

Cook food to the appropriate temperature (145°F for roasts, steaks, chops of beef, veal and lamb; 160°F for pork, ground veal and ground beef; 165°F for ground poultry and 180°F for whole poultry). Use a thermometer to be sure! Foods are properly cooked only when they are heated long enough and at a high enough temperature to kill the harmful bacteria that cause illness.

Prevent cross-contamination. Bacteria can spread from one food product to another throughout the kitchen and can get onto cutting boards, knives, sponges and countertops. Keep raw meat, poultry, seafood and their juices away from other foods that are ready to eat.

Handle food properly. Always wash your hands before touching food and after using the bathroom, changing diapers, or handling pets, as well as after handling raw meat, poultry, fish, shellfish or eggs. Clean surfaces well before preparing food on them.

Never defrost food on the kitchen counter. Use the refrigerator, cold running water, or the microwave oven.

Never let food marinate at room temperature; refrigerate it.

Divide large amounts of leftovers into small, shallow containers for quick cooling in the refrigerator.

Remove the stuffing from poultry and other meats immediately and refrigerate it in a separate container.

Do not pack the refrigerator. Cool air must circulate to keep food safe.

Food Irradiation

Food irradiation is the treatment of food with high energy such as gamma rays, electron beams or x rays as a means of cold pasteurization, which destroys living bacteria to control foodborne disease. The United States relies exclusively on the use of gamma rays, which are similar to ultraviolet light and microwaves and pass through the food leaving no residue or “radioactivity.” Food irradiation is currently approved for wheat, potatoes, spices, seasonings, pork, poultry, red meats, whole fresh fruits and dry or dehydrated products. Although irradiation destroys many bacteria, it does not sterilize food. Even if you’re using food that has been irradiated by the manufacturer, you must continue to take precautions against foodborne illness, through proper refrigeration and handling, to safeguard against any surviving organisms.

Links to Other Disorders

Scientists suspect that foodborne pathogens are linked to chronic disorders and can even cause permanent tissue or organ destruction. Research suggests that when some people are infected by foodborne pathogens, the activation of their immune system can trigger an inappropriate autoimmune response, which means the immune system attacks the body’s own cells. In some people, an autoimmune response leads to a chronic health condition.

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Q: Is it common to find cancerous polyps in a Colonoscopy?

A: It is very rare to find cancer in polyps. Sometimes microscopic cancer cells may exist but they are very very small. The idea is to identify and remove any potential polyps that have cancer potential.

Q: Are there risks of undergoing a Colonoscopy?

A: The procedure is a very safe procedure. But, with any procedure there are risks involved when using anesthesia but everything is carefully monitored by the doctor and his team to ensure the reduction of all risks to the patient.

Q: How often should I get a Colonoscopy?

A: It is recommended that everyone seek a doctor for a colonoscopy starting at the ages between 45-50. In general, physicians recommend that patients receive a colonoscopy every 5 years, and even more frequently for those patients whose family history includes colon cancer who should get checked every 3-5 years.